FEED ADDITIVES ▶▶▶
Feed additive combo for better digestibility
Research has shown that a combination of a protease and multi-strain Bacillus probiotic improves energy and protein digestibility in grower-finisher pigs, leading to increased growth and feed
BY LAURA PAYLING, SCIENTIST, DUPONT, UK A 80
Control digestibility DFM effect
78 76 74 72 70 Control Protease DFM
Protease+ DFM
Protease effect Combination effect 3750 3700 3650 3600 3550 Control Protease DFM
Protease+ DFM
▶ ALL ABOUT FEED | Volume 25, No. 10, 2017 29
s the single largest cost in pig production, feed is a common target when managing costs. However, low-cost ingredients often have low energy densi- ty and high fibre, two characteristics that make
nutrients less accessible and also negatively impact the hind gut by hindering gut structure development and decreasing absorptive function. Given pigs’ limited ability to digest fibre, these high-fibre diets pose significant nutritional and health challenges. For example, corn distiller’s dried grains and solu- bles (DDGS) has 21% of protein bound to fibre. A pig’s endog- enous digestive capacity in the small intestine is insufficient to break down and liberate all of the nutrients from this fi- bre-protein complex. Microbial fermentation of protein oc- curs when these fibre-bound nutrients reach the hind gut, causing higher concentrations of ammonia and biogenic amines. Ammonia levels impact health and performance
Figure 1 - The effect of the protease + DFM combination (Syncra® SWI) on protein digestibility was greater than the additive effects of the protease and DFM alone.
indifferent ways. It can affect gut structure development, which can decrease the gut’s digestive and absorptive func- tion. Plus, high levels of ammonia in manure can increase the incidence of bacterial growth and respiratory infection. Levels as low as 10 ppm have been shown to decrease efficiency and profitability.
Solutions to improve digestibility Due to pigs’ limited ability to digest fibre, the use of feed ad- ditives to improve digestibility and growth performance has garnered much attention. In recent years, strains of Bacillus have been used as a probiotic and have exhibited multiple benefits, including improvements in growth performance, nutrient digestibility, blood characteristics, and decreased faecal gas emissions. Benefits from Bacillus are thought to re- late to inhibition of non-beneficial bacteria and immunomod- ulatory effects, together with the support of beneficial host microbiota. The Bacillus strains have even shown the capabili- ty of adjusting the type and quantity of enzymes they pro- duce. However, the benefits of some probiotics can be incon- sistent. The impact of exogenous protease. which is known to increase the hydrolysis of proteins in the small intestine, liber- ating peptides and amino acids for absorption and utilisation has also been highly studied. In some circumstances protease has been shown to improve protein and energy digestibility, but results can be inconsistent.
Figure 2 - The effect of the protease + DFM combination (Syncra® SWI) on energy digestibility was greater than the additive effects of the protease and DFM alone.
3800
Control digestibility DFM effect
Protease effect Combination effect
Apparent total tract digestibility of Nitrogen (%)
Digestible Energy (kcal/kg)
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